| Document and Entity Information - USD ($) $ in Millions | 12 Months Ended | ||
| Dec. 31, 2020 | Apr. 19, 2021 | Jun. 30, 2020 | |
| Cover [Abstract] | |||
| Document Type | 10-K/A | ||
| Amendment Flag | true | ||
| Amendment Description | EXPLANATORY NOTE This Amendment No. 1 on Form 10-K/A (this “Amendment”) amends the Annual Report on Form 10-K for Capital Senior Living Corporation (together with its subsidiaries, the “Company”) for the fiscal year ended December 31, 2020, which was filed with the Securities and Exchange Commission (the “SEC”) on March 31, 2021 (the “Original Filing”). We are filing this Amendment to include the information required by Part III and not included in the Original Filing, as we will not file our definitive proxy statement within 120 days of the end of our fiscal year ended December 31, 2020. Except as set forth in Part III below and the updates to the List of Exhibits, no other changes are made to the Original Filing. The Original Filing continues to speak as of the date of the Original Filing. Unless expressly stated, this Amendment does not reflect events occurring after the filing of the Original Filing, nor does it modify or update in any way the disclosures contained in the Original Filing. Accordingly, this Amendment should be read in conjunction with the Original Filing and our other filings with the SEC. Information in this Amendment regarding the number and price of shares of the Company’s common stock, par value $0.01 per share (“Common Stock”), reflects the 1-for-15 reverse stock split of the Common Stock that became effective on December 11, 2020. | ||
| Document Period End Date | Dec. 31, 2020 | ||
| Document Fiscal Year Focus | 2020 | ||
| Document Fiscal Period Focus | FY | ||
| Trading Symbol | CSU | ||
| Title of 12(b) Security | Common Stock, $.01 par value per share | ||
| Security Exchange Name | NYSE | ||
| Entity Registrant Name | Capital Senior Living Corporation | ||
| Entity Central Index Key | 0001043000 | ||
| Current Fiscal Year End Date | --12-31 | ||
| Entity Well-known Seasoned Issuer | No | ||
| Entity Current Reporting Status | Yes | ||
| Entity Voluntary Filers | No | ||
| Entity Interactive Data Current | Yes | ||
| Entity Filer Category | Non-accelerated Filer | ||
| Entity Shell Company | false | ||
| Entity Small Business | true | ||
| Entity Emerging Growth Company | false | ||
| Entity Common Stock, Shares Outstanding | 2,117,481 | ||
| Entity Public Float | $ 22.3 | ||
| Entity File Number | 1-13445 | ||
| Entity Incorporation, State or Country Code | DE | ||
| ICFR Auditor Attestation Flag | false | ||
| Entity Tax Identification Number | 75-2678809 | ||
| Entity Address, Address Line One | 14160 Dallas Parkway | ||
| Entity Address, Address Line Two | Suite 300 | ||
| Entity Address, City or Town | Dallas | ||
| Entity Address, State or Province | TX | ||
| Entity Address, Postal Zip Code | 75254 | ||
| City Area Code | 972 | ||
| Local Phone Number | 770-5600 | ||
| Document Annual Report | true | ||
| Document Transition Report | false | ||
| Documents Incorporated by Reference | DOCUMENTS INCORPORATED BY REFERENCE None. |
